Mandrel



July 3, 1928.

M. B. GRouT MANDREL Filed Feb. 23, 1924V 4 Sheets-Sheet l July 3, 192s,-

M, B. GRoU-r MANDREI Filed Feb. 2s, 1924 Patented July `3, 1928.

UNITEDSTATES PATENT OFFICE.

i MARTIN B. GROUT, CHICAGO, ILLINOIS, ASSIG-NOR TO. KELLOGG SWITCHBOARD AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MANDREL.

.Application lcd February 23, 1924. Serial No. 694,561.

My invention relates to mandrels, and has to do more particularly with Winding mandrels, such as are used in `connection Wit-h winding machines of themultipletype, and which are 4associated with the Winding spindle o the multiple Winding machine. Multiple `winding' machines of they -above type permitthe sin'iultaneons winding ot a. plurality ot electromagnet coils on the Winding mandrehand an object of my invention is the provision of anA improved mandrel which is simple in construction and operation and provided with positive means `for gripping the tube to rotatably secure it on the mandrel upon which the electromagnet coils are Wound.

Different types ot mandrels have been devised ilor use in connection With Winding machines ol the multiple type, such as collapsible or expamling mandrels, but these have been deficienhespecially the means for grippingthe 'bore ofthe tubeto rotatably secure itl to the mandrel during the Winding operation. Theftypcs of mandrels above mentioned are provided. with various means, suoli as iingers,`movable bars or ribs, for gripping the bore ot the tube to secure the same on the mandrel: but these various gripping means are delicient in that the gripping means does not grip thebore of the tube upon which the electromagnets are Wound equally throughout its length, and this inequality of the gripping means of the mandrel results in finished coils which are not unit'orm in shape and of a predetermined size as to diameter.- Mandrels` of the above type are also providedwith means such as dogs, springs or other means for expanding and collapsing the mandrel which requires complication of mechanism` that necessitates manual adjustment each time a new tube is placed on the mandrel or a finished tube removed. y i

To overcome these deficiencies in mandrels of the expandingtype new in use, l have designed an expanding. mandrel which obviates the abovementione'd defects, and afeature of my invention is the provi sion of a mandrel which is provided with a core member and a sectional shell, the sections ot which are superimposed on the core. Suitable means associated with the core and sections of the shell of the mandrel cause the shell sections to remain normally in their expandedposition, the said means acting upon each other to expand the shell equally throughout its length which permits the mandrel oi my invention to hold its true diameter thrmighout .its entire length when in its expanded position.`

rlinother feature of my invention is the provision o'l means for controlling the collapsing and `exlntnsioin of the mandrel, which means is in thelform ot a` controlling lever connected with a yoke member operatively associated with a barrel `or sleeve which linked to the sections of the shell cit the mandrel,v and through the agency o a suitable spring supported in the sleeve `the tension is such as to hold the shell sections siiipierimposed'upon the core of the mandrel in their expanded position. The lever when moved rocks the yoke which is operatively associated with the lever and sleeve to which the shell sections ofthe mandrel are secured,

to cause the said shell sections superimposed` upon `the core ol' the n'iandrel to collapse through the agency of suitable means se cured tothe shell sections and the core of the mandrel.

Another feature of my invention is the provision of a mandrel comprising a core which supports a plurality of rib members and means secured to the core of the mandrel for cooperating with the rib members to hold the rib members in their expanded position through the agency of suitable spring means. The means 'for holding the rib menibers in their expanded position through the agency of the spring means expandsthe ribs equally throughout their length., which thus permits the i'nandrel to hold its true size and form throughout its entire length When in its e);- panded position. i

Anothenfeature ot my invention is the provision oi' a sliding bearing` support which may be moved lfmgitudinally by means ot suitable lever means to permit the end of the mandrel to be disassociated from its bearing so that a` tube .supported on the mandrel may be removed when. the said mandrel is collapsed. A y

The above named features, as Well as others, will `be more fully described in the ensuil'lg speciiication, and "for a more complete nndmfstanding of my invention' reterence may be had to the accompanying dravvings in connection Withthe detailed descrip- (lll tion in Which like reference characters in the several vievs denote like parts, and in which:

Fig. 1 is an elevation of t-he mandrel o'i my invention illustrating its supporting means and controlling lever for controlling the e2;- pansion and collapsing of the mandrel.

Fig. 2 is a plan view ot Fig. 1.

Fig. 3 is a sectional view along 3 3 of Fig. 1.

Fig. 4 is a sectional view along the line il ot' Fig. 2 to clearly illustrate the construction ot the expanding mandrel in its e.\'- panded position.

Fig. 5 is a sectional view similar to Fig. 3 illustrating `the mandrel in its collapsed position.

Fig. 6 is an enlarged sectional view along the line (5 6 ot F ig.` 4t.

Fig. 7 is an enlarged sectional view along the line 7 7 of Fig. 4.

Fig. S is an eleva-tion of another form ot mandrel illustrating its supporting means and controlling lever itor controlling the e;\' pansion and collapsing ot the mandrel.

Fig. 9 is a sectional view taken on the line 9 9 ot F ig. S illustrating the mandrel in its expanded position.

Fig. 10 is a sectional View of vthe mandrel similar to Fig. 9 but illustrating the mandrel in its collapsed position.

Fig.11 is a sectional View taken on the line 11-11 of Fig. s.

Fig. 12 is an enlarged elevation ot the the line r support which rotatably supports one end ot the mandrel.

Fig. 13 is a sectional View along the line 13 13 of Fig. 12; and

Fig. 14 is a sectional View along the line ifi-ii of Fig. is.

Referring now more in detail to my invention illustrated in the accompanying drawings, and relerring particularly to Figs. 1 to 7, inclusive, the mandrel M illustrated comprises a core 2 cylindrical in shape, and which is provided with three slots 3, L1 and 5, cut in the peripheral face of the core inember 2, each slot being spaced 120 degrees apart. A plurality of core members (l are secured to the slots 3, 4- and 5 by means of suitable rivets 7. The core members are spaced equi-distant in the slots 3, L1 and 5 With respect to each other throughout the length ot the slots 3, 4 and 5, and each core member 6 is in alignment with a core member 6 in an adjacent slot. The ends ot the core members 6 secured in the slots 3, 41 and 5 are provided with angularly disposed 'faces 8 and 9 for purposes as will presently be described and their iaees 10 are arcuate in shape to conform With the peripheral tace of the core 2.

The shell S Which comprises the expanding and collapsible portion of the mandrel M comprises three sections 11, 12 and 13,

arcuate in shape, and which when slidably supported by the core 2, as will be more fully hereinafter described, are in concentric relation with the core 2. Any suitable means may be employed to construct the shell sec tions 11, 12 and 13. such as a tube of proper size which is slotted its entire length, the said slots being spaced around its peripheral tace 12() degrees apart, and when thus cut, the sections 'termed by this slotting operations form the shellinembers or sections 11, 12 and 13. l. place a .tferrule upon one end of the tube and secure it thereto in any suitable manner be'tore slotting so that when the three shell sections 11, 12 and 13 are formed, the ends ot each section 11, 12 and 13 is provided with a shouldered lug 111. llVhen the sections 11, 12 and 13 are slidably supported on the core 2 in concentric relation therewith, the lugs 14 on the three sections 11, 12 and 13 form as a Whole a ferrule for purposes as will presently be described.. lllhile have described one method of constructing the shell sections 11, 12 and 13, I do not, however, wish to be limited to the exact structure as just described, as other methods ot construction are readily apparent.

The shell sections 11, 12 and 13 are eac-h provided with a plurality ot' shell members or ribs 15` which are secured to the inner peripheral lace 16 ot each section equi-distant trom its edges by means of suitable rivets 17 and equi-distant along the shell sections 11. 12 and 13 with respect to each other throughout the length ot the shell sections. Each rib 15 is in alignment With a rib 15 secured to an adjacent shell section, and the ends of the ribs 15 secured to the respective shell sections 11, 12 and 13 are provided with angularly disposed faces 18 and 19, for purposes as will presently be described.

vThe shell sections 11, 12 and 13 are slidably supported on the core 2, and these shell sections 11, 12 and 13 are associated, respec tively, with the slots 3, et and 5, and the ribs 15 on the respective sections 11, 12 and 13 cooperate, respectively, with the core members G in their associated slots 3, 4 and 5, and as all the shell sections are similarly supported, the detailed description of the means provided for slidably supporting the shell section 11 will sutlice. The shell section 11 when placed upon the core 2 preparatory to its being slid-ably supported thereon, is positioned to place the ribs 15 secured to the section 11 in alignment with the slot 3 with its ribs 15 above the opening or gaps 2O between the spaced core members 6 in the slot 3. Then the shell section 11 of the sectional shell S thus positioned with its ribs 15 located in relation to the gaps 2() between the core members 6 as just described, the angular .taces 1S and 19 of the ribs 15 have un inclination opposite that of the angular faces 8 and 9 of the core members 6. The

shell section l1 is now ready to be slidably attached to the core 2 and to accomplish this, the shell section 11 is moved forward, causing the angular faces 19 ofthe ribs to engage the ,angular faces 9 of the core members 6 in the slot 3, and the continued forcing of the shell sect-ion 11 forward causes the angular faces 19 of the ribs 15 to ride or slide on the angular faces 9 of the core members 6 in the slots 3'. Due to the opposite inclination of theangular faces 18 and 19 of the ribs 15 and the angular faces 8 and 9 of the core members 6, the shell section 11 is forced or drawn down in relation to `the center of the core 2 until the bottom faces 9 of the coreumembers 6. The sections 12 and 13 are also slidably supported upon vthe core 2 in thesame manuel: as just described in connection. with the shell section 11 with their respective ribs 15 resting in the openings or gaps between the core members 6 spaced in the slots 4 and 5 of the core 2, and with their angular faces 18 and 19 engaging the angular faces 8 and 9,01 the core members 6. The shell sections 11, 12 and 13 when slid-ably supported, as just described, on the core 2 form as a Whole the sectional shell S which restsfin concentric relation with the core 2.

Having described in detail the construction of the mandrel M of my invention, I

will now describe in detail the means employed for controllingthe expansion and collapsing` of the mandrel. M and the bearing supports B and B for rotatably supporting the mandrel M. The spindle shaft 23 which is connected to a suitable driving means extends through a bearing B in the `end plate 24 of the Winding machine frame, and for a more detailed description of its connect-ion with the driving means and its relation to the entire Winding machine, ref! erence may be had to` a co-pending applica-` tion tiled by 11'1e,.Martin B. Groet, `and bearing S. N. 683,923. The end 25 of the spindle shaft 23 `is provided with an orifice 26 of a size to receive the extending end, 27 of the mandrel core2 and a pin 28 passing through `:'niitable orifices in the spindle shaft 23 `and core 2 connects the mandrel spindle shaft .23.

A sleeve member 3() provided with a reduced portion or neck 31 is slipped over the mandrel M after the shell sections 11, 12 and 13 have been placed on the core 2 to be slidably supi'i'orted thereby to form a cylindrical core 2 to the body and its neck 31 is provided with an ori-` tice 32 o f a siZe to receive the reduced portion 33 of the fel-rule, formed by the lugs 14 secured to the shell sections 11, 12 and 13 the body portion of the ferrule resting in the i The slots 35 in the sleeve member 30 when' the same is positioned on the mandrel M, as illustrated in Figs., 4 and `are in align ment With'the slots 36 formed between adjacent shell sections slidably supported upon the core 2 and screws 37 which pass through suitable orifices 38 infthe `neck 31 of the sleeve member 30 have screw-thrczuled engagen'ient With suitable tapped orifices in the lugs 14 on the shell sections 1.1, 12 and 13. The sleeve member 3() is supported upon the sectional shell member S against lateral movement but may be expanded due to the slots 35, the means for expanding the same and its function will be presently described. A collar 40 provided with a shouldered orilice 411is of. a size to permit it being slipped over the spindle shaft end 23, which is provided with a shoulder 42 against which the collar 40 rests. A helical spring 43 i slipped over the end 25 of the spindle shaft 23 and `rests in the bore 44 of the sleeve member 30,

and a ring nut 45 having an orifice 46 of a Uli lUU

size to permit it being slipped over the shaft Y i end 25 has screw-threaded engagement `with the threaded portion of the bore ofthe sleeve member 39. The helical spring 4? is placed under conipression as the ring nut 45 is threaded into the bore 44 of the sleeve 80, one end ofthe spring bearing against the collar 40 supported on the spindle shaft 23,` and `its other end` bearing against the ring nut 45 and cooperates Withthe slotted sleeve 3() and the shell sections 1l, 1 2 and 13 linked thereto by means of the screws 37 for purposes as will presently be described. A yoke member 51 pivotally supported between a pair of supporting members 52 and 53 by means of a pivot pin` 54, spans the sleeve member 39 and places the yoke 51 in opera` tive` relation with; the sleeve member 30. The supporting member 52 is inthe form of `a plate andsecured to the front face of the end plate 24 of the winding machine frame by means of the screws 55. The other sup.- porting `member 53 is also secured to the end plate l24 and is provided with an extended portion 56 to which the actuating lever 57 is pivotally secured by means of the lill with a suitable handle. The yoke 51 is provided with anl integrally formed extension extendingl parallel with the supporting plate 52 and this extension 60 of the yoke 51 is provided with an angular portion 61 which cooperates with the actuating lever 5'( to rock the yoke 51 about its pivot 54 when the lever is moved to bring about the collapsing ot the mandrel M, as will presently be described.

Y The mandral M is rotatably supported at its other end by means of a slidable support SL as clearly illustrated in Figs. 12-1-1 inclusive. This support SL may be moved alone` a suitable supporting shatt so that the end 132 ot the mandrel M may be moved free o'f itsl supporting; bearingfi 63 to permit a finished tube o't electromafi'nets to be removed from the mandrel M and. another tube placed thereon. A sliding arm 64 is provided which is secured to a sleeve inember 65 in any suitable manner, as by nieans ot a torce tit. and a collar (36 provided with a central orifice G7 is adapted to be slipped on the reduced portion 68 et the sleeve ($5 and rotatably supported thereon, and an annular reduced portion 70 ot the collar 66 extends into a suitable oritice 71 in the face oit the supporting arm G4. The collar (36 is provided with a pair ot annular am faces 73 diametrically opposite and cooperate with a ring; shaped member 'Tet secured to a bracket 7G and which rine- 74 is also provided with diametrically opposite angular cam 'faces 7 5 whose angle of inclination is opposite that ot the angular cam faces 73 oit the collar GG which rotatably supported on the sleeve G5 for purposes as will presenlly be described. A suitable shaft 77 supported by the bracket 7G extends throne-h suitable orifices in the ring' member 7-1 and sleeve and supports the slidable arm (il and its supported parts. The arm (Sel supporting the bearingT G3 is 0i the usual ball bearing' type. into which the reduced end 62 ot the core 2 ot the mandrel M extends to rotatably support the mandrel M as a whole between the end plate 241: and the bearingr 63 in the slidable arm Get. A helical spring is supported on the sleeve 65 and rests between the arm of the bracket 7G. and the annular shoulder 81 on the sleeve 65. The compression of the helical spring S() is such as to force the sleeve 65 and its supported arm til to the left with reference to Fig. 1 and as the collar 66 is also rotatably supported on the sleeve 65. it is also moved with the sleeve 65 to place its annular cam faces 73 into engagement with the angular cam faces 7 oit the ring; member 7 l secured to the lee et' the bracket 7 6, for purposes as will presently be described. I provide a U- sliaped member S2 pivoted to the slidable arm G1 by means ot' a pivot pin 83, which is provided with an integrally formed depending member Sel provided with an arcuate 'taced toothed rack which meshes with the teeth 86 in the peripheral tace of the rotatable collar (3G supported on the (35. key way S8 is cut in the bottom vtace of the slidable arm 6l and a key c ecurcd to the bracket 7G rests in the key SS tor purposes as will presently be described. Handles 90 and 91 secured, re spectively`A to the slidable arm G1 andthe Vil-shaped pivoted member 82 are provided tor operating the slidable handle, as will nonv be described.

Having: described in detail the construction et the expanding mandrel of my inven` tion. and' its su) iortine )arts` I will now -l n. y

describe the operation ot the s:

The shell sections 11, 12 and 12? ot the seetional shell S ot' the, mandrel M are linked to the sl fe member 30 by means ot the fi which pass through suitable ori- L1. l2 ..ilt is thus readily apparent that any movement ol the sleeve 30 along the shalt 23 will produce longitudinal movement et the shell sections 11. 12 and 13 alone; the core 2 upon which they are slid ably suiriported as before described. The spi-ingr l155 which is supported in the bore of the sleeve is under compression so as to torce the sleeve 30 and its attached shell sections 11. 12 and 13" to the lett with ref erence to Fig. 4. This movement of the shell sections 11, 12 and to the lett causes the angular faces 18 and 1t) o1' the ribs 15 on the shell sections 11, 12 and 13 to ride upon the angular faces S and 9 ot the core members t3 secured in the slots 3, 4 and 5 ot' the core 2. Due to the opposite inclination ot the faces 18 and 19 o't a rib 15 in relation to the angular 'faces S and 9 of its adjacent core members G between which eachrib 15 rests, the torce or pull applied to the sleeve 3() by the spring: 113 will cause the sections 11, 12 and 13 to spread or expand which expansion is brought about by the angular faces 18 and 19'ot the ribs 15 on the respective shell sect-ions 11, 12 and 13 riding on the angular faces S and 9 ot the Core members 2 secured in the slots 3, et and of the core 2. The spreading ot the shell sections 11. 12 and lupon the core 2 due to their movement to the left under the intiuence of the helical spring 43, is equal throughoutthe length of each shell lsection 11, 12 and 13 and with the type of construction just described it may readily be seen that the 'diameter of the sectional shell S which comprises shell sections 11, 12 and 123, expands equally hroughout its length as to its increased diameter. thus maintainin .-fr the contour of the mandrel as to its cylindrical form true throughout its length. The mandrel M of my invention with its expanding liu ` pivot 54.-.

sectional shell S provides means for gripping the bore of a tube over its entire inner peripl'ieral bore and length. As the shell sections 11, 12 aud 13 are spread or eX- panded, the periiiiheral face of the ferrule F formed by the lugs l-t on the end of the shell sections 11, 12 and 123 engages the inner `peripheral face of the bore 34: of the reduced neck portion 31 of the sleeve El() and expands the slotted wall of the sleeve 30, permitting the expansion of the sectional. sleeve S.

The mandrel as illustrated in Figs. 1, 2 and l is shown in its normal expanded position. in which position a tube is secured thereto against rotation and longitudinal movement New to collapse the sectional shell S so that a tube supported on the mandrel niay be removed, the lever 57 is grasped by the operator and moved to the right with reference to Fig. 2, causing the beveled erge 95 of the lever57 to engage the angular face (51 of the yoke extension 60. This causes the extension to `tilt upward and causesthe yoke 5l to rock about its This movement of the yoke 51 to the right causes the lugs 96 secured to the legs 97 of the yoke 51 to engage the annular shoulder 98 on the sleeve 30 and move the sleeve 3() to the right along the shaft 23. The shaft 23 and the connected core 2 of the mandrel as a whole are held against longitudinal movement by means of the collar 99k secured to the shaft 23 bynieans of a set screw, and the shoulder 190 formed on the shaft 253 as clearly illustrated in lf 4land 5, and as one end of the helical spring` 43 rests against the collar -l-O simported on the shaft 23, the movement to the right of the sleeve vvill place the spring` under additional compression. The shell sections 11, 12 and 13 being linked to sleeve 30 by means of the screws 37, causes the shell sections 11, 12 and 13 to slide alone the core 2 of the mandrel and due to the opposite inclination of the angular faces 18 and 19 of the ribs 15 andthe angular faces 8 and 9 of the coremember G, the force orpush applied by the yoke 51 to the .meeve 30 will cause the shell sections ,1.11 l2 and 13 to collapse due to the angular relation of angular faces 18 and 19 of the ribs on the respective shell sections 11, 12 and 13 causing them to ride on the angular faces 8 and 9 of the core members 6 secured in the slots 3, 4t and 5 of the core 2. lllhen the bottom faces 21 of the ribs 15 on the shell sections l1, `12 and 13 engage the bottom 22 of the slots 3, 4 and 57 as illust-.interi in Fig. 5, the sectional sleeve is fully collapsed so that the tubesupported thereby may be removed, that is, afterthe slidable suppoi SL moved as will now be descril'ied. The slidable support SL is adapted to be moved to the right with reference to Fig. to with draw the core end 62 from the bearing 63 supported by the arm 6ft of the slidable support SL. plish this the lever 91 secured to the pivoted U-shaped member 8-1 is pressed forward with referenceto Fig. 2 and as the arcuate toothed rack l85 s in mesh with the tooth periphery 86 of the collar 66, the said co1- lar 66 is rotated as it is loosely supported on the sleeve 65 secured to the arm 64. Due t0 the opposite inclination of the, angular faces 73 of the rotatable collar 66 and the angular faces 75 `of the ring member 74 i'ixed to the bracket 7 6,*the angular faces 73 of the `collar 66 ride on the angular faces 75 of the stationary ring member 74 forcing the ar1n6-i-and its supported parts to the right along the shaft 77 `against the normal compression of the spring- 80, the arm 64 beingl guided in its direction to the rightby the key 89 in key Way 88. The continued movement. of the handle 91 forces the arm 64: to the right until it disengages the key `is released and the spring 43 supported in the sleeve 30 having been placed under compression by the movement of the sleeve 30 to the right, now moves the sleeve 3() to the left and as the shell sections 11,12 and 13 arelinked to the sleeve 30, they are also nioved to the left to again bring about the expansion of the shell sections 11, 12 and 13 of the sectional shell S to grip the bore of the tube, all of which has been previously described in detail. The movement of the sleeve 30 to the left under the influence of the spring L13 forces the yoke 51 to the left, and causes the angular face 61 of the yoke extension 60 to ride on its beveled edge 95 of the lever 57 `and force it into its normal position. To again place the c-oreend 62 in its bearing 63, the arm 64 is again rocked on its supporting shaft 77 until it is in a position to again permit the key 89 to enter thc'rkey Way 88 and when thus aligned, the spring 80 which was placed under compression by the movement of the sliding arm (5f-l to the right,V forces the sliding arm 64 and its parts to the left permitting the core end 2 to again enter the bearing 63 again placing` the angular faces 73 of the collar 66 into engagement with the angular faces 75 of the member 74;, and also restore the level' 91. to its normal position.

Referring` now to Figs. 8 to 11, inclusive, l illustrate another form of mandrel which is adapted to scciue a square tube `on the mandrel during the winding operation. The

To accom- Y mandrel M is ot the expanding` type and comprises a core 200 `cylindrical in shape and provided With four slots 101, 102, 103 and 101 cut in the peripheral tace of the core, each slot being spaced 90 degrees apart. A plurality ot core members 105 provided with extending lugs 10G which t into suitable orifices 107 in the bottom of the slots 101, 102, 103 and 101 by means of a drive lit to secure them in the slots. The core members 105 are spaced equi-distant apart in the slots 101, 102, 103 and 104 with respect to each other throughout the length o1 the said slots each core member 105 being in alignment with a core member 105 in adjacent slots. The core members 105. are provided with angular faces 108 for purposes as vvill presently be described.

The expanding' members ot the mandrel are in the form oit ribs 109, 110, 111 and 112, which rest in the slots 101, 102, 103 and 101 in thecore 100. The ribs 109, 110, 111 and 112 are slidably supported in the slots 101, 102, 103 and 104: and as each rib siniilarly constructed, and slidablj,7 supported in its associated slot, a description oit one Will be typical o1" the others. The rib 109 provided With a plurality of toothed notches 113 which notches 113 are spaced along the bottom tace 1111 ot the rib 109 so as to register or align themselves with the core members 105 secured in the slot 101. The toothed notches 113 in the bottom tace oit the rib 1141- have an angular inclination opposite that o t the angular faces 10S ot the core members 105 secured in the slot 101 and cooperate. to allow the rib 109 to expand or collapse as will presently be described.

Having described in detail the construction and methoo t slidably supporting the rio 109 in its associated slot 101, it readily apparent from the above description how the ribs 110, '.11 and 112 are supported in their associated slots.v 102, 103, and 104; and the ribs 109, 110.. 111 and 112 When in their fully collapsed position in the. slots 101. 102. 103 and 1.01 rest therein With their bottom faces 1.1/1 enojan-ing the bottom oit their respective slots 101, 102, 103 and 104.

The core 200 ot the mandrel illustrated in 3 to 11. inclusive, is secured Vto the spindle shalit 23 in the same manner as described in detail in connection with Figs. 1 to 7, and the sleeve supported thereon and its supported parts which coperate with the ribs 109, 110H 111 and 112 to bring about their expansion and collapsing` is the same as previously described. and a further description is not thought necessary only to mention that the sleeve provided vcith tour slots 120, to permit the slotted sections oit the sleeve 30 to cooperate with the said ribs. The ends 10i .v 110` 111 and 112 ot the ribs 109. 110. 111 and 112 are provided with integrallyiormed shouldered portions 121 which rest in the bore of the reduced portion 31 of the sleeve 30, and screws 37, passing through suitable orifices 38 in the sleeve 30, and having screw-threaded engagement with tapped orifices in the shouldered portions 1241 ot the ribs 109, 110, 111 and 112 link the said ribs to the sleeve 30.

The spring 43 supported in the sleeve 30 is under compression so as to hold the mandrel in its expanded position` as the torce or pull exerted by the spring 13 causes the sleeve 30 to move to the lett with relation to Figs. 7 and S and as the ribs 109, 110, 111 and 112 are linked to the sleeve 30 by the screws 37, the said ribs 109, 1107 111 and 112 are also moved to the left in their respective slots 101, 102, 103 and 101 in the core 100. Due to the opposite angular inclination ot the core members 105 in the slots 101, 102, 103 and 101 and the toothed notches 113 in the ribs 109, 110, 111, and 112` this 'movement ot the said ribs to the left causes the toothed notches 113 oi ribs 109, 110, 111 and 112 to ride upon the angular faces 108 of the core members 105 moving' the said ribs outward with relation to the center ot the core 200 into their expanded position. The ends 1092, 1102, 1112 and 1122 of the ribs 109, 110, 111 and 112 are tapered and a sleeve 130 secured to the core end 200 by means ot a drive fit is provided with a tapered oriiice 131 which tapered orifice 131 overlaps the I tapered ends 1092, 1102, 1112 and 1122 ot the ribs 109, 110, 111 and 112. The ends 109', 110', 111 and 112 of the ribs 109, 110, 111 and 112 are retained .in the core ot the reduced portion 31 ot the sleeve 30 by the shoulder formed thereon and the tapered oriiice 131 in the sleeve 130 retains the rib ends 1092, 1102, 1112 and 1122 so as to slidably support the ribs 109, 110, 111 and 112 in their respective slots 101, 102, 103 and 101 against displacement.

The means tor collapsing the mandrel are the same as described in detail in connection'yvith Figs. 1 to 7, inclusive, and to collapse the mandrel the lever 57 moved to the right causing the yoke 51 to rock about its pivot 541 to force the sleeve 30 to the right against the normal compreion ot the spring l13 in the sleeve 30, and duc to the screw conneetion 37 between the sleeve 30 and the ribs 109, 110, 111 and 112 which links them to the sleeve 30, the said ribs are also forced to the right, and due to the opposite angular inclination o t the faces 108 ot the core niembers 105 and the toothed notches 113 in the ribs 109, 110, 111 and 112, the said ribs are moved inward with relation to the center of the core 200 until the bottom faces 114 ot the said ribs engage the bottom of the slots 101, 102, 103 and 10-1 Vand in which position the mandrel is fully collapsed. To permit the mandrel to again expand the lever 57 is released and due to the compression of the ou y spring the sleeve l30 is again forced to the left, and astlie ribs 109, 110, 111 and 112 `are linked to thesleeve 30, the said ribs are also moved to theleft, and d ue to the opposite angular inclination of the faces 108 of the core members 1.053 and the toot-hed notches 113 in the ribs 109, lll), 111 and 11.2, the saidribs are moved outward with relation to the center of the core l0() to again place the said ribs in. their expanded position.

Myiimproved device is particularly adapted foruse in multiple Winding machines for winding a plurality of electromagnets simultaneously and provides a lirm grip between the tube and the mandrel. Theexpandin manrele as heretofore-rA used required a compication of mechanism, besides necessitating manual adjustment ea li time a new tube applied or a linished 'ube removed. With the improved mandrel of my invention it is only necessary to operate a lever which automatically collapses the mandrel to remove a finished tube, andafter a` neiv tube Vhas been applied to .release the lever when the mandrel expands autoiiiatically to gripthe tube equally throughout its length to maintain the tube in its true cylindrical form. It is also to be noted that my improved mandrel is simple `in `construction, `providing for eco-many of manufacture and the parts are held together through an ingenious arrange, ment which renders the mandrel practically' proof against derangement or getting out of order. L i e Various `modilications might be made in the form and structure ofthe parts Without departing from the spirit and scopeof the inventions, and I therefore aimto cover all such changes and modifications as come within the spirit and scope of they appended claims. i

What I claim as new and desire to secure by United States Letters Patent, is:

1. Iny a mandrel of the charactcrdescribed comprisinga core and arcuate Shaped sec* `tional shell members extending longitudinally thereof, longitudinal slots in said core and n'ieans secured to said sectional shell members and in said slots, said means comprising members having inclined faces adzuited to engage each other for slidably supportingsaid sectional shell `members on saidcore to form a unitary cylindrical structure, aspring Afor maintainingr said shell members in their normal positions, and means for placing said spring under coinpression and thereby sliding said shell menibers.

2. In a mandrel of the character described comprising a core and arcuate shaped sectional shell members extending longitudinally thereof, longitudinal slots in said'core and means secured to said sectional shell members and in said slots, said means comprising members having inclined faces adapted to engage each `other for slidably supporting said sectional shell members in concentric relation on said core to form a unitary cylindrical structure in either of their expanded or collapsed positions, a spring for normally expanding said shell members, and means for placing said spring under compression to cause said shell members to assume their collapsed position.

'3. Ina mandrel of the character described comprising a core and arcuate shapedsectional shell members extending longitudinally thereof, a rotatable shaft connected with said core and a slidable sleeve support ed on said shaft, longitudinal slots in said core,` means secured to said sectional shell members and in said slots for slidably sup` porting said sectional `shell members in concentric `relation on said core to form a unitary cyliiuirical structure :iii either their expanded or collapsed position and means controlling tlie movement of said sleeve to place said sectional sleeve members in either of their expanded or collapsed positions, said last means including a spring for normally expanding said sleeve members, a yoke member, a lever adapted to move said yoke membei" to place said spring under additional. coinpi'ession and thereby move said sleeve member to cause. said shell members to assume their collapsed position.

Il. In a mandrel of the character described *comprising a core and arcuate shaped seclrelation with said core to'form a unitary cylindrical structure and means for controlling the movement of said sleeve and its linkedsectional shell members to place them in either of their expanded or collapsed positions, said last means including a spring for normally expanding Said sleeve members, a yoke member, a lever adapted to ino'vesaid yoke member to place said spring under additional compression and thereby move said sleeve member to cause said shell members `to assume their collapsed position. 5. In a mandrel of thecharacter described comprising a core and arcuateshaped sectional shell members extending longitudinally thereof, rib members having angular end faces spaced alongsaid shell sections,` longitudinal slots in saidcore, ribs having angular end faces spaced in said longitudinal slots, the ribs of said shell sections resting between the spaced core members in said slo'tsfand having their angular end faces in engagement at all times 'with faces of oppolho site angular inclination, on the said spaced core members to support said shell sections in concentric relation with said core to form a unitary cylindrical structure in either of the expanded or collapsed positions.

G. ln a mandrel of the character described comprising a core and arcuate shaped sec tional shell members extending longitudinally thereof, longitudinal slots in said core7 rib members having angulaiend faces spaced along said shell sections, core members having angular end faces spaced in said longituuinal slots, said rib members resting between the spaced core members in said slots and having their angular end faces .in engagement at all times with faces of opposite angular inclination, on the said spaced core members to support vsaid shell sections in concentric relation with said core to form a unitary cylindrical structure in either of their expanded or collapsed positions and means linlied with said shell sections for controlling the movement of said shell members in either their expanded or collapsed positions.

T. ln a mandrel of the character described comprising a core provided with longitudi` nal slots, arcuate shaped sectional shell members extending longitudinally of said core to form a unitary cylindrical structure, ribs having` angular end faces spaced along said shell members, core members having an-v gular end faces spaced in said slot-s, said rib members resting between said core members in said slots, a rotatable shaft `connected with said core, asleeve slidably supported on said shaft and linked to said shell sections, a spring supported in said sleeve under compression so as to place said shell sec` tions in tl wir expanded positions effected by the opposite angular inclination between said rib members and said core members, and means including a lever and a yoke member for placing said spring under additional comjreffsion to cause the angular faces oi' the rib members to cooperate With the faces of the core members to place the shell members in their collapsed positions.

8. ln a mandrel of the character described comp a core provided with longitudinal slots, arcuate shaped sectional shell members extending longitudinally of said core and in concentric relation therewith to form it" y cylindrical structure, ribs having r faces spaced along said shell mem` bers, core members having angular end faces spaced in said slots, said rib members rest- U' between the spaced core members in said and having their angular end faces in engagement at all times with faces of opposite angular inclination, on the said spaced core members, a rotatable shaft connected with said core, a sleeve slidably supported on said shaft and linked to said shell sections, a spring supported in said sleeve tensioned to place said shell sections in their expanded positions eifected by the opposite angular inclination between saidrib members and said core members and means for moving said sleeve member toicause said linked shell sections to assume their 'collapsed positions eil'ected by the opposite anguiar inclination between said rib members and said core members.

9. ln a mandrel of the character described comprising a core provided with longitudinal slots, ribs extending longitudinally of said core and resting in said slots, core members-spaced in said slots and toothed notches spaced in said ribs, means for slidably securing said ribs in said slots, said core members and said toothed notches cooperating to cause the expanding and collapsing of said ribs, spring means for maintaining said ribs in their expanded position and means inclu ding a lever `and a yoke .member adapted to cooperate with the spring means to cause the same to be placed under additional compression whereby the ribs are placed in their collapsed position.

10. In a mandrel of the character de scribed comprising a core provided with longitudinal slots, ribs extending longitudinally of said core and resting in saidvslots, core members having angular faces spaced in said slots, toothed notches in said ribs, means for slidably securing said ribs in said slots and spring means for normally maintaining said ribs in their expanded position, means including a lever and a yoke member adapted to place said spring means under additional compression to cause the said ribs to assume their contracted position, said expansion and contraction `heilig effected by the opposite angular inclination-of said core members and said toothed notches.

11. In a Ymandrel 4of the character described comprising a core provided with longitudinal slots, ribs provided with toothed notches and extending longitudinally of said core and resting in said slots,core members having angular faces spaced in said slots resting in the notches in said ribs, means for slidably securing said ribs in said slots, `means inclucling a spring linked to said ribs for normally maintaining said ribs in their expanded position, means including a lever and a yoke member adapted to rplace said spring .means under additional compression to cause the said ribs to assume their contracted position, said expansion and contractiolrbeing effected by the opposite angular inclination of said core members and said toothed notches.

l2. In a mandrel of .the character de* scribed comprising a core provided with longitudinal slots, ribs extending longitudinally of said core and resting in said slots, toothed notches in said ribs, core members having angular faces spaced in said slots and restlil() ing in the toothed notches in said ribs, the angular faces of said core' members being in engagement at all times with faces of the opposite angular inclination of theV said toothed notches, means for slidably securing said ribs in said slots, and means linked to said ribs for maintaining said ribs in their expanded position under the influence of spring means, said expansion of said ribs being effected by the opposite angular inclination of said core members and said toothed notches. i

13. A mandrel of the character described including a core slidably supporting a plurality of members forming a unitary device and adapted to be moved radially from` the center of the device, and means including sets of rib members on saidV core having angular end faces, rib members on said plurality of members having angular end faces adapted to be' in engagement at all times with faces of the rib members on said. core of the opposite angular inclination for so moving said members, said means maintaining said members in their positions.

14;. A mandrel of the character described including a core slidably supporting a plurality of members forming a unitary device, and spring means adapted tocooperate with other means including rib members on said core having angular end faces, rib members on said plurality of members having angular end faces adapted to be in engagement at all times with faces of the rib members on said core of the opposite angular inclination for moving said members radially from the center thereof to increase the outer circumference of the device, said spring means for maintaining said members in their expanded positions.

15. A mandrel of the character described including a core slidably supporting a plurality of members forming a unitary device,

and spring means'adapted to cooperate with other means including rib members on said core having angular end faces, rib members on said plurality of members having angular end faces adapted to be in engagement at allV times with faces of the rib members on said core of the opposite angular inclination for moving said members radially from the center thereof to increase the outer circumference of the device and for maintaining them in their expanded position and means for compressing said members.

, 16. An expansion core comprising a central shaft, an outer shell composed of a plurality of individual strips, an end cap, means connecting said end cap to said strips for connecting the strips for unitary movement, means connected to said end cap for moving the strips longitudinally upon movement of said means, blocks carried by said shaft and arranged in pairs having their facing ends inclined, blocks carried by said strips and having inclined ends slidably engaging the inclined ends of said first named blocks whereby said strips will be moved inwardly towards or outwardly from the shaft upon longitudinal movement of the strips.

17. An expansion core comprising a central shaft, an outer shell composed of a plurality of individual strips, an end cap in engagement with the strips for moving the same longitudinally, blocks carried by said shaft and arranged in pairs having their parallel facing ends inclined, blocks carried by said strips and having inclined ends slidably engaging the inclined ends of said first named blocks whereby said strips will be moved outwardly from the shaft upon longitudinal movement of the strips.

Signed b me at Chicago, in the county of Cook and tate of Illinois, this 21st day of February, 1924.

. MARTIN B. GROUT. 

